Hi!
I'm new to reefkeeping, I've bought a complete, mature all-in-one tank (Red Sea Max Nano) with plenty of corals inside. I'm aware that because of that, I've skipped all the lessons of starting the tank, coral selection and introduction, parameters tuning and so on. I'm doing my best to learn how to take care of a saltwater tank, but in this situation I feel kind of hopeless. Enough of the introduction lets get to the issue I'm having.
One of the coral species I bought with the tank was (correct me if I'm wrong) Pavona Cactus, total of 3 colonies, each 5-7 cm wide. Here you can see picture of one taken soon after the tank was moved and rescaped.
I looked pretty healthy, it had nice deep color and looked fluffy with all the polyps extended.
Unfortunately few weeks later it looks terrible. Please excuse quality of the photo, its deep into the tank and I can't do any better than that.
All 3 colonies lost most of its color, they barely extend any polyps, it looks like they're dying.
About the parameters now, I think the key might be in there.
Currently tests show following parameters:
Salinity: 35 ppt (handheld refractometer, calibrated with Salifert Refracto Check 35 ppt fluid)
Temperature: 27 deg C (without a heater, pumps must heat the water a lot)
Ca: 470 ppm (Salifert)
Mg: >1500 ppm (Salifert, its 1570 ppm if I go over the nominal scale)
Alk: 7.7 dKH (Salifert)
NO3: <0.5 ppm (Salifert)
PO4: 0 (Zoolek)
But when I first got the tank the alkalinity was only around 5 dKH. I have dosed sodium bicarbonate and some sodium carbonate to bring it up to 8.0. I tried to do it slowly, no more that 0.5 KH with each dose, the rise from around 5 to 8 took me 3 days. Since then I see a drop of around 0.3 dKH per day, I'm keeping it up with sodium bicarbonate solution. I plan to add Calcium Hydroxide (Kalkwasser) to my ATO to keep it stable. Other parameters looked Similar
Also previous owner did 20% monthly changes with NSW. I do 10% weekly with synthetic, I use Aquaforest Reef Salt.
All Pavona colonies are placed high in the tank, with plenty of light, water flow is not too strong in there.
Do you think I can do anything to save the corals at this point? Could they possibly recover?
I'm new to reefkeeping, I've bought a complete, mature all-in-one tank (Red Sea Max Nano) with plenty of corals inside. I'm aware that because of that, I've skipped all the lessons of starting the tank, coral selection and introduction, parameters tuning and so on. I'm doing my best to learn how to take care of a saltwater tank, but in this situation I feel kind of hopeless. Enough of the introduction lets get to the issue I'm having.
One of the coral species I bought with the tank was (correct me if I'm wrong) Pavona Cactus, total of 3 colonies, each 5-7 cm wide. Here you can see picture of one taken soon after the tank was moved and rescaped.
I looked pretty healthy, it had nice deep color and looked fluffy with all the polyps extended.
Unfortunately few weeks later it looks terrible. Please excuse quality of the photo, its deep into the tank and I can't do any better than that.
All 3 colonies lost most of its color, they barely extend any polyps, it looks like they're dying.
About the parameters now, I think the key might be in there.
Currently tests show following parameters:
Salinity: 35 ppt (handheld refractometer, calibrated with Salifert Refracto Check 35 ppt fluid)
Temperature: 27 deg C (without a heater, pumps must heat the water a lot)
Ca: 470 ppm (Salifert)
Mg: >1500 ppm (Salifert, its 1570 ppm if I go over the nominal scale)
Alk: 7.7 dKH (Salifert)
NO3: <0.5 ppm (Salifert)
PO4: 0 (Zoolek)
But when I first got the tank the alkalinity was only around 5 dKH. I have dosed sodium bicarbonate and some sodium carbonate to bring it up to 8.0. I tried to do it slowly, no more that 0.5 KH with each dose, the rise from around 5 to 8 took me 3 days. Since then I see a drop of around 0.3 dKH per day, I'm keeping it up with sodium bicarbonate solution. I plan to add Calcium Hydroxide (Kalkwasser) to my ATO to keep it stable. Other parameters looked Similar
Also previous owner did 20% monthly changes with NSW. I do 10% weekly with synthetic, I use Aquaforest Reef Salt.
All Pavona colonies are placed high in the tank, with plenty of light, water flow is not too strong in there.
Do you think I can do anything to save the corals at this point? Could they possibly recover?